*{
    margin: 0;
    padding: 0;
}

html body{
    width: 100%;
    height: 100%;
}

div{
    width: 200px;
    height: 120px;
    margin: 0 auto;
    background: rgba(0, 0, 0, 0.3);
    /* float: left; */
}
div input{
    width: 180px;
    height: 30px;
    margin: 5px 5px;
    border: transparent;
    border-bottom: 2px solid black;

    font-size: 20px;
    text-align: center;
    line-height: 30px;
}

div button{
    width: 180px;
    height: 30px;
    background: rgba(0, 0, 0, 0.3);
    border: none;

    margin: 5px 5px;
}

